A/C TEMPERATURE DIFFERENTIAL (STRATIFICATION) BETWEEN LEFT AND RIGHT FRONT PANEL OUTLETS TECHNICAL SERVICE BULLETIN Reference Number(s): 24-007-02, Date of Issue: August 5, 2002 Related Ref Number(s): 24-007-02 ARTICLE BEGINNING SUBJECT A/C Temperature Differential (Stratification) Between Left and Right Front Panel Outlets OVERVIEW This bulletin involves diagnosing A/C temperature difference (stratification) between the left and right front panel outlets. MODELS 2001-2002 (RS) Town & Country/Caravan/Voyager 2001-2002 (RG) Chrysler Voyager (International Markets) SYMPTOM/CONDITION More than 12 F. Warmer outlet air temperature on the left front panel outlet as compared to the right front panel outlet when the HVAC controls are set to max cold. DIAGNOSIS Set the A/C controls so that the compressor is engaged, the air within the vehicle is being recirculated, the output air is being directed through the panel outlets, the temperature control is in the full cool position, and the front and rear (if equipped with rear A/C) blower motor(s) are operating at their highest speed. Use a temperature probe to measure the front left and right panel outlet temperatures. If the difference between the two panel outlets is greater than 12 F, perform the diagnostic procedure below.
CHRYSLER: 2001-2002 (RS) Town & Country/Voyager; (RG) Chrysler Voyager (International Markets) DODGE: 2001-2002 (RS) Caravan GROUP: 24 - Heating & A/C NOTE: THIS BULLETIN APPLIES TO RS/RG VEHICLES EQUIPPED WITH DUAL ZONE MANUAL (HAD), 3 ZONE MANUAL (HAG), OR ATC (HAH) CLIMATE CONTROL SYSTEMS
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CALIBRATION TEST Description Heater, Ventilation and Air Conditioning (HVAC) control module must be recalibrated each time a door actuator is replaced or when HVAC control module is replaced. It is necessary for HVAC control module to learn feedback voltage values for each door stop position for all doors in front HVAC unit housing, and rear HVAC unit housing (if equipped). If any door actuator is out of calibration, HVAC system will not perform a maximum efficiency. 1. Turn ignition switch to ON position. Simultaneously depress and hold power (PWR) button and recirculation button of front control panel for 5 seconds, then release. LED lights of front control panel will begin to flash when calibration procedure has begun. Calibration procedure should take less than 3 minutes to complete. 2. When front control panel LED lights stop flashing, this indicates calibration procedure has been successfully completed. If LED lights remain flashing for longer than 3 minutes, HVAC control module has detected a fault with actuator door calibration. LEDs will continue to flash until even after ignition switch has been cycled off and on, until a successful calibration test is completed, or until vehicle has been driven about 3 miles. For diagnostic procedures for calibration test failure, see READING DIAGNOSTIC TROUBLE CODES under SELF- DIAGNOSTIC SYSTEM. PROGRAMMING RECIRCULATION PROGRAMMING Description Recirculation function is controlled by Heater, Ventilation and Air Conditioning (HVAC) control module and automatically returns to outside air mode as default setting, after an ignition cycle. This is done to prevent odors from building up in HVAC housing. It is recommended that recirculation mode be used as little as possible in humid climates to prevent odors from forming inside vehicle cabin. For hot/dry climates, people allergic to pollen or other airborne particles, or for drivers that find it necessary to frequently use recirculation mode, HVAC control module can be programmed to default to recirculation mode at end of an ignition cycle by performing the following procedure: 1. Start engine. Turn front blower motor switch to any position except off. Set mode control selector to face position. 2. Turn ignition switch to OFF position. Depress and hold recirculation button. Start engine, and continue to hold recirculation button and observe recirculation button LED indicator light. The recirculation button LED indicator light will flash repeatedly. When recirculation button LED indicator light stops flashing, release recirculation button. Programming is complete. 3. Turn engine off. Wait 10 seconds, then restart engine. Verify recirculation mode default setting is properly programmed. Repeat this procedure to select between recirculation mode default and outside air mode default settings.
HEATER-A/C CONTROL CALIBRATION The heater-A/C control module must be recalibrated each time an actuator motor or the control module is replaced. If the vehicle is so equipped, the calibration procedure also includes rear HVAC positions for each actuator motor. 1. Turn the ignition switch to the On position. Simultaneously depress and hold the Power and Recirculation buttons on the heater-A/C control for at least five seconds. 2. The manual heater-A/C control power Light Emitting Diode (LED) and Recirculation LED, or the Automatic Temperature Control (ATC) heater-A/C control Delay and Recirculation graphics will begin to flash when the calibration procedure has begun. 3. The calibration procedure should take less than two minutes to complete for the manual heater- A/C control, and less than twenty seconds for the ATC heater-A/C control. When the LEDs or graphics stop flashing, the calibration procedure is complete. 4. If the LEDs or graphics continue to flash beyond the normal three minute (manual) or twenty second (ATC) calibration time, it indicates that the heater-A/C control has detected a failure and a Diagnostic Trouble Code (DTC) has been set. 5. Use a DRBIII scan tool to perform further diagnosis. Refer to the appropriate diagnostic information. The LEDs or graphics will continue to flash even after the ignition switch is cycled Off and On, until a successful calibration is completed or until the vehicle has been driven about 8 miles.
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Monday, August 31st, 2009 AT 4:16 PM